‘Overlocking’, not interlocking
The interlocking grip places the index finger of the gloved hand between the ring and little fingers of the lower hand. It’s a good way of uniting the hands, used by Jack Nicklaus and Tiger Woods, but if you choose this grip you have to be careful. That interlocking is often overdone… with power and club control taking a hit.
The key to a better interlock is not to link the hands with the full length of your fingers. Position them so the trail-hand little finger and gloved-hand index finger are only partially entwined.
Grip the club with this reduced interlock and you will be able to hold the club in the fingers and not the palms – allowing much more wrist mobility and a full, powerful wrist cock.